How to Fix a Damaged Cob Wall

A quick message before I begin, from a bioconstruction project in South Africa We’ve launched a crowdfunding campaign to help finish building a training centre in early childhood development in one of the most dangerous suburbs in Cape Town. We are busy building a passive solar, earth sheltered building out of tyres, cob, compressed earth…

Stone Wall Foundations for a Cob House (with Lime Mortar)

Here at Eco Caminhos, Brazil, we have just started our second eco build. We are building an ecolodge in a beautiful location up in the hills near Nova Friburgo, Rio de Janeiro. We started by digging the foundations down to the hard bedrock, sloping the foundation towards the edge of the hill to make sure…

Make a Natural, Breathable Limewash Paint

Preparing your paint is pretty easy. You just need your lime in a putty form before you start, this may mean soaking it for at least a month or just mixing your powder with water, depending which lime you use. Mix your pigment with warm water. You can make natural pigments using earth, charcoal, and…

How to Test your Earth for Cob

If you are thinking of making some cob, for an earthen oven, or for your new home, then you are going to need to start by testing the earth you wish to use. You need to know how much clay and sand are in your earth so you know how much sand or clay to…

How to Test and Make Exterior Render using Cow Poo

The Quick Answer… Find a good ratio of cow poo, sand and clay. We ended up using 1 earth, 1 poo, 2 sand, water and add linseed oil at 4% of total volume to increase water resistence. Remember that the linseed oil will make your mix a lot wetter so maybe better to add that…